Thanks... i thought concrete paving is the way to go too. I'm just a bit puzzled as to why our current house (circa 2005) has paving instead of concrete as it wouldn't provide as much of a barrier for water.

I have been wondering the same thing as we are about to build and have been reading the Csiro guide lines. I was wondering about doing pavers to and using a good road base under them with the correct fall. Any more thoughts and would doing pavers that way be cheaper then concrete ?

No, you can still have the pavers but use 75mm concrete apron underneath instead of road base.

This!

You can even have loose pebbles, cobble stones, or something else if you go this route.

Edit:From my (granted, quite limited) reading of various rules, there is nothing to stop you from having the watertight apron be at a lower level than the actual surface. It's to stop water falling in around the foundation/slap and creating havoc down there. So as long as you get something sturdy that directs the water away from that, you are good to go.

I'm getting concrete around the slab. Fortunately I've found a good concreter, his concrete slopes the correct way and drains off into a drain near the garage. And around the rest of the house will just slope away from the house slab itself.